Physics Test

Result

Physics Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

An electron is moving in a circle of radius 6π cm in anticlockwise direction in a horizontal plane with an increasing speed. Then,

A
the magnetic field produced at the centre is directed into the page

B
the angular velocity is always directed out of the page at all speeds

C
the angle between magnetic moment produced and angular momentum is 180^o

D
All are Correct

Solution

The path of electron in anticlockwise direction is equivalent to a current loop in clockwise direction. Using right hand rule, the magnetic field and magnetic moment associated with it are directed into the plane of the paper.

The angular velocity and angular momentum associated with the moving electron are directed out of the plane of the paper. Angle between the angular momentum and the magnetic momentum is 180°.
Question 2
1 / -0

A

B

C

D
All are correct

Solution
Question 3
1 / -0

P.E. (U), Conservative force and various equilibrium conditions possible are given in the column 1,column 2 ,and column 3 respectively.

In which case a body displaced slightly from equilibrium position has no tendency to return or move away from original position?

A
(IV) (i) (S)

B
(I) (ii) (R)

C
(II) (iv) (Q)

D
(III) (iii) (P)

Solution
Question 4
1 / -0

Various graphs are drawn between the current and voltage for an a.c. circuit containing 'R' or 'L' or 'C' or any combination of R, L and C.

In which case is the current in the circuit less than the maximum current and the frequency of circuit is less than the resonant frequency?

A
(II) (i) (S)

B
(II) (iv) (R)

C
(II) (ii) (P)

D
(III) (iv) (R)

Solution

For the series LCR circuit, the impedance of the circuit is minimum at resonance and the current in the circuit will be maximum at resonance.
Below and above the resonant frequency, the current in the circuit is less that the maximum value.
If φ is the phase angle between current and voltage, then we have,

At resonance, the current and the voltage is in phase. Below the resonant frequency the resonance voltage is leading while above the resonant frequency the resonance current is leading.
Question 5
1 / -0

Various graphs are drawn between the current and voltage for an a.c. circuit containing 'R' or 'L' or 'C' or any combination of R, L and C.

In which case the power consumed in the circuit is zero?

A
(I) (i) (S)

B
(I) (ii) (R)

C
(III) (i) (Q)

D
(I) (iii) (S)

Solution

When the phase difference between current and voltage is 90o, then the power consumed is zero.
When the ideal inductor is connected across the alternating current, then the voltage is leading the current by 90°, so the power consumed is zero.
When an ideal capacitor is connected across the alternating current, then the voltage is lagging the current by 90°, so the power consumed is zero.
Question 6
1 / -0

Various graphs are drawn between the current and voltage for an a.c. circuit containing 'R' or 'L' or 'C' or any combination of R, L and C.

In which case the power consumed is maximum?

A
(IV) (i) (R)

B
(I) (iii) (S)

C
(II) (ii) (P)

D
(IV) (ii) (R)

Solution

At resonance, the phase difference between current and voltage is zero. The impedance of the circuit is minimum and the corresponding current in the circuit is maximum.
Question 7
1 / -0

In an interference experiment shown in the figure, the narrow slits S₁ and S₂ are illuminated with coherent sources, each of frequency 10¹⁴ Hz. The initial phase difference between the sources is zero. The slits are separated by a distance d = 3.0 mm. The resultant intensity is I (θ) on the screen (measured as a function of θ, where θ is defined as shown). If I0 is the maximum intensity, then I (θ) for θ between 0^o and 90^o (both inclusive) is given by

A
I(θ) = I₀ for θ = 30^o

B
I(θ) = I₀for θ = 90^o

C
I(θ) = I₀ for θ = 0^o

D
All are correct

Solution
Question 8
1 / -0

Consider two magnets of magnetic dipole moment 'M' and length 'l' (<< r) placed with centre to centre distance 'r' in the configuration shown in column I. Force between them is given in column II and the corresponding potential energy is given column III. Consider the black end as the north pole.

Match columns II and III with column I.

A
(ii) - (B) - (Q)

B
(ii) - (C) - (Q)

C
(ii) - (A) - (R)

D
(ii) - (D) - S

Solution
Question 9
1 / -0

For an ideal diatomic gas, the P-V diagrams are shown. The various quantities indicated in the columns are calculated. The relative values are also given.

In which graph, the change of internal energy is 225 J and the heat absorbed is 270 J?

A
(I) (iii) (Q)

B
(I) (i) (S)

C
(IV) (i) (R)

D
(III) (iv) (P)

Solution